On Thu, 19 Jan 2023 at 08:36, Uladzimir Bely <ubely@ilbers.de> wrote:

I got time to get back to this patches and checked this moment. And it really
does not work as I expected.

Original patch includes the following:

-        --chroot-setup-commands="cp -n --no-preserve=owner ${ext_deb_dir}/
*.deb -t ${deb_dir}/ || :" \
+        --chroot-setup-commands="ln -Pf ${ext_deb_dir}/*.deb -t ${deb_dir}/
2>/dev/null || :" \

This results to to failing "ReproTest" in CI with the following error (for
libhello, for example):

sbuild-build-depends-dose3-dummy:armhf : Depends: dose-distcheck:amd64 but it
is not installable
E: Unable to correct problems, you have held broken packages.

To debug it, I removed `2>/dev/null` and found, that hardlinks simply don't
work and the following errors are now seen earlier:

ln: failed to create hard link '/var/cache/apt/archives/adduser_3.118_all.deb'
=> '/home/builder/libhello/rootfs/var/cache/apt/archives/
adduser_3.118_all.deb': Invalid cross-device link
... #tons of similar errors...
ln: failed to create hard link '/var/cache/apt/archives/
zlib1g_1%3a1.2.11.dfsg-2+deb11u2_mipsel.deb' => '/home/builder/libhello/
rootfs/var/cache/apt/archives/zlib1g_1%3a1.2.11.dfsg-2+deb11u2_mipsel.deb':
Invalid cross-device link

I: Finished running 'ln -Pf /home/builder/libhello/rootfs/var/cache/apt/
archives/*.deb -t /var/cache/apt/archives/ || :'.

So, it works for network builds (when missing packages always can be
downloaded by apt), but it fails for local builds from apt-cache (when, at
first network build, sbuild dependencies are simply not exported to download
directory due to non-working hardlinks, plus with hidden stderr)